Preparation

Preheat oven to 350°. Using electric mixer, beat butter, shortening, both sugars, eggs and vanilla in large bowl until well blended. Sift in flour, baking soda and salt; beat to blend. Mix in oats, chocolate chips, nuts and raisins.

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Recent Review

I substituted a banana for the shortening, as suggested below. Note that this does give the cookies a distinctly banana flavor.
As many others have noted, if you bake as recommended, the cookies end up flat; I found the edges were well-browned, and center still uncooked at 10 minutes.
In my second batch, I lowered the temperature to 325, and let them bake for the full 15 minutes. This resulted in thicker evenly-baked cookies. A temp in between is probably correct.
Be sure to spray/grease your cookie sheet, even if it is non-stick, and let the cookies cool at least 10 minutes on the sheet before trying to move them to a cooling rack.
A good recipe, but I'm still looking...